I currently have aquatech 5-15 on my two ten gallons however I came in to a GREAT Sale and bought several extra and upgrading filters.. i have aquatech 10-20 and aquatech and tetra 20-40 would the aquatech 20-40 be to large ?? It will not be a betta tank. more thank likely some sort of tetras and corys and maybe RCS

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So God created great sea creatures and every living thing that scurries and swarms in the water